body {
    background: #282c34;
}

.frame {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    border-radius: 10px;
    background: radial-gradient(ellipse at center, #f6e8d7 0%, #dabe9b 100%);
    box-shadow: 30px 30px 30px -10px rgba(0, 0, 0, .5),
        inset 15px 15px 20px rgba(255, 255, 255, .3),
        -15px -15px 35px rgba(255, 255, 255, .3),
        inset -1px -1px 10px rgba(0, 0, 0, .3);
}